How much transmission fluid you need depends on the job. A drain and fill, or a pan drop with filter change, usually replaces only part of the fluid, often just a few quarts, because much of it stays in the torque converter, valve body and cooler. Refilling a dry transmission after an overhaul takes the full capacity, which is much more. If you are only topping up, add a little at a time and recheck. Your owner’s manual or service information gives the exact figures for your transmission.
How much fluid for each job
| Job | How much fluid |
|---|---|
| Topping up | Small amounts until the level reads correctly |
| Drain and fill (drain plug) | Roughly what came out, often a few quarts |
| Pan drop and filter change | A little more than a drain and fill |
| Machine exchange (flush) | Close to the total capacity plus extra to purge old fluid |
| Dry fill after rebuild or replacement | Full total capacity, including the converter |
The easy way: measure what comes out
Drain into a container with volume marks, then add back about the same amount and check the level by the correct procedure. Buy a little extra, since some fluid stays on the pan and filter.
How much transmission fluid to add if low
Add a small amount, such as half a quart, run the engine and shift through the gears, and check again. Overfilling causes foaming and leaks just as underfilling causes slipping. If the level was low, find the leak; see transmission fluid leak.
Specific transmissions
For the GM 4L60E, see 4L60E fluid capacity and type. For fluid types by transmission, see transmission fluid chart. Sealed units without a dipstick are filled to a check plug; see checking fluid without a dipstick.
Drain and fill vs flush
Several drain-and-fills spaced over a few weeks gradually replace most of the old fluid. A machine exchange replaces more at once; see transmission flush vs change and how to change transmission fluid.
Checking the level after a refill
After adding fluid, run the engine, move the shifter through each position, and check the level at the temperature the procedure calls for. Fluid expands as it warms, so a cold reading can look low. Recheck after the first drive and top up in small amounts.
Replacement transmissions
A replacement or rebuilt transmission arrives with little or no fluid in it, so plan for the full capacity, including the converter, and follow the installer’s fill and check procedure. See our transmissions.
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